A post shared by State Of Grace Tattoo (@stateofgracetattoo) on Jun 16, 2017 at 8:04am PDT

The experts say the designs require “a heck of an artist to pull them off correctly” because of the awkward shape of the knee.

And, knee tatts are also incredibly painful.

Du Buddha Tattoo commented: “The horrible pain, caused by a tattoo gun needle, which in this case feels rather like a sharp blade cutting through the skin deep into the bones, occurs due to lack of adipose tissue here.